Features and Benefits

  • Wide Input Power Supply
    • 3V to 24V Supply Voltage
    • 500mA (max) Output Current
    • 1.8V, 3.3V, or 5.0V Factory-Set VOUT with Optional I2C Control: 1.5V to 7.5V in 50mV Steps
    • External Feedback Resistor VOUT Option (1V to 99% VSUP)
    • Hardware or Software Enable
  • Dual-Input Power MUX Replaces Common-Cathode Diode Arrays
    • Automatic Ideal-Diode ORing Voltage Selector
    • 250mΩ MOSFETs Minimize Power Consumption, BOM, and Solution Size
  • Low IQ Enables Always-On Rails
    • 1.5µA Quiescent Current (Only SUP Powered)
    • 19µA Quiescent Current (IN1/IN2 Powered)
    • 88% Peak Efficiency (12VSUP, 3.3VOUT)
  • Safe and Easy to Use
    • Short-Circuit and Thermal Protection
    • 8ms Soft-Start
    • Software-Enabled Spread Spectrum
    • Pin-Programmable Inductor Peak Current Level
  • Small Size
    • 2.33mm × 1.42mm (0.7mm max height) Wafer-Level Package (WLP)
    • 15-Bump, 0.4mm Pitch, 3 × 5 Array

Product Details

The MAX77756 is a synchronous 500mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX). The converter operates on an input supply as low as 3.0V and as high as 24V. Default output voltage is factory-programmed to either 1.8V, 3.3V, or 5.0V. Output voltage is further adjustable through external resistors or an I2C serial interface.

The dual-input power MUX selects the higher voltage from two different input sources to power the step-down converter. Control circuitry ensures that only one channel of the MUX is on at a time to prevent cross-conduction between input sources. For single-input applications, the MUX can be bypassed and the step-down converter can be powered directly from the SUP pin.

The MAX77756 is available in a small 2.33mm × 1.42mm (0.7mm max height), 15-bump wafer-level package (WLP). For a similar buck converter without a power MUX, refer to the MAX77596.

Design Solution: Pack More Power in Your Cool, Small Smart-Home Hub ›


  • Battery-Powered Systems, Backup Battery, Uninterruptible Rails
  • Home Automation, Low IQ Smart Hubs
  • Notebook and Tablet Computers
  • USB Type-C Power Delivery Accessories and Devices

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

EE-Sim Power® Tools

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.



MAX77756 SIMPLIS Schematic

MAX77756 SIMPLIS Schematic

Product Recommendations

MAX77756 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.